Everyone has been telling me that to mill with tiny endmills, I need very high spindle speed. The max speed of the default Sherline spindle is 2800 rpm, which mean that I've to go extremely slow (around 50mm/min) and very shallow (like 0.2mm in aluminium) if I'm to use a 1mm endmill. The last roller I need was done at 100mm/min with DOC at 0.20mm per pass. I was told that I'm risking the endmill.

I remembered buying the 10K pulley upgrade from Mike of SG Tooling several years ago and started digging through the boxes. Found it still wrapped up in plastic in the box. After reading through the installation guide many times, I proceeded to put it on the machine.

The pulley set, buried in the pile of stuff I buy through the years.

The old pulley taken off. I tried not to disturb the alignment of the spindle during the installation.

After carefully aligning the pulleys to make sure there are no rubbing.

Found this. Some kind of sensor I bought many years back. Still sealed in its bag. I forgotten who I bought it from and how to install it. It has a USB connector on one end of the cable. So I assume it should be directly connected to PC. I prefer it to go to my controller instead.

Stripping everything down.

Different type of stand off being used in this. The pulley is also bigger than the original.

Wanted to test the spindle speed after the installation but this junk refused to be switched on... This is my 2nd piece, both from China through eBay.

Its now 2.30am in the morning. I think I better stop here and get some sleep. I want to bring the girls out tomorrow to walk along the river near my place.

Let me leave you with this video of the spindle running up to its max speed, whatever it is, since I didn't adjust the spindle preload and have no way to test. Click here to view on YouTube: Sherline 10k RPM Pulley in operation